| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | has been [vb pp] [adv] [to-vb] | 49 |
|
| 2 | has [been] [vb pp] [adv] [to-vb] | 49 |
|
| 3 | has be [vb pp] [adv] [to-vb] | 49 |
|
| 4 | has [be] used [adv] [to-vb] | 13 |
|
